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Credit Quality of Loans and Allowance for Loan Losses - Loans Individually Evaluated for Impairment (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
With no related allowance recorded [Abstract]    
Recorded Investment $ 41,148 $ 29,851
Unpaid Principal Balance 41,729 30,135
Average Recorded Investment 23,890 16,442
Interest Income Recognized 190 859
With an allowance recorded [Abstract]    
Recorded Investment 19,329 20,101
Unpaid Principal Balance 19,451 21,299
Related Allowance 3,837 2,927
Average Recorded Investment 19,715 13,807
Interest Income Recognized 61 314
Totals [Abstract]    
Recorded Investment 60,477 49,952
Unpaid Principal Balance 61,180 51,434
Related Allowance 3,837 2,927
Average Recorded Investment 43,605 30,249
Interest Income Recognized 251 1,173
Commercial, financial and agricultural    
With no related allowance recorded [Abstract]    
Recorded Investment 26,802 22,529
Unpaid Principal Balance 27,383 22,793
Average Recorded Investment 13,401 11,484
Interest Income Recognized 131 745
With an allowance recorded [Abstract]    
Recorded Investment 3,085 5,189
Unpaid Principal Balance 3,182 6,373
Related Allowance 1,105 961
Average Recorded Investment 4,137 3,704
Interest Income Recognized 25 138
Totals [Abstract]    
Related Allowance 1,105 961
Real estate - construction    
With no related allowance recorded [Abstract]    
Recorded Investment 10 37
Unpaid Principal Balance 10 37
Average Recorded Investment 23 45
Interest Income Recognized 0 0
Real estate - commercial    
With no related allowance recorded [Abstract]    
Recorded Investment 13,254 5,886
Unpaid Principal Balance 13,254 5,886
Average Recorded Investment 9,341 3,903
Interest Income Recognized 56 97
With an allowance recorded [Abstract]    
Recorded Investment 15,031 14,004
Unpaid Principal Balance 15,031 14,004
Related Allowance 2,270 1,585
Average Recorded Investment 14,518 9,236
Interest Income Recognized 28 161
Totals [Abstract]    
Related Allowance 2,270 1,585
Real estate - residential    
With no related allowance recorded [Abstract]    
Recorded Investment 1,062 1,365
Unpaid Principal Balance 1,062 1,385
Average Recorded Investment 1,115 954
Interest Income Recognized 3 17
With an allowance recorded [Abstract]    
Recorded Investment 769 538
Unpaid Principal Balance 769 538
Related Allowance 194 160
Average Recorded Investment 653 533
Interest Income Recognized 0 7
Totals [Abstract]    
Related Allowance 194 160
Installment loans to individuals    
With no related allowance recorded [Abstract]    
Recorded Investment 20 34
Unpaid Principal Balance 20 34
Average Recorded Investment 10 56
Interest Income Recognized 0 0
With an allowance recorded [Abstract]    
Recorded Investment 444 370
Unpaid Principal Balance 469 384
Related Allowance 268 221
Average Recorded Investment 407 334
Interest Income Recognized 8 8
Totals [Abstract]    
Related Allowance 268 221
Total: Commercial    
With an allowance recorded [Abstract]    
Related Allowance 3,375 2,546
Totals [Abstract]    
Recorded Investment 58,172 47,608
Unpaid Principal Balance 58,850 49,056
Related Allowance 3,375 2,546
Average Recorded Investment 41,397 28,327
Interest Income Recognized 240 1,141
Total: Construction    
With an allowance recorded [Abstract]    
Related Allowance 0 0
Totals [Abstract]    
Recorded Investment 10 37
Unpaid Principal Balance 10 37
Related Allowance 0 0
Average Recorded Investment 23 45
Interest Income Recognized 0 0
Total: Residential    
With an allowance recorded [Abstract]    
Related Allowance 194 160
Totals [Abstract]    
Recorded Investment 1,831 1,903
Unpaid Principal Balance 1,831 1,923
Related Allowance 194 160
Average Recorded Investment 1,768 1,487
Interest Income Recognized 3 24
Total: Consumer    
With an allowance recorded [Abstract]    
Related Allowance 268 221
Totals [Abstract]    
Recorded Investment 464 404
Unpaid Principal Balance 489 418
Related Allowance 268 221
Average Recorded Investment 417 390
Interest Income Recognized $ 8 $ 8